Have a 2004 9-5 Arc. I've recently noticed a weird noise when first accelerating after starting my car. The best I can describe it as is sort of a rubber band noise; where you stretch out the rubber band and pull on it until it snaps back into place. Sort of that rubbery boing sound. It's just a weird sound. It only seems to happen on the first acceleration after starting the car. Does anyone have any idea what I'm talking about? The sound is difficult to describe, but I can almost "feel" in the pedal when it happens.